Sanyo LA8670M Specifications

Monolithic Linear IC

Ordering number : EN4930

52095TH (OT) No. 4930-1/10

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Double-Conversion Narrow-Band

FM IF System

LA8670M

Overview

The LA8670M is a narrow band FM IF system for use in
communication equipment. In addition to the functions
required for FM reception, the LA8670M provides a rich
set of additional functions including noise detection and
field strength detection, and is thus optimal for cordless
telephones.

Functions

• First mixer, first local oscillator, first local oscillator
buffer output, second mixer, second local oscillator

• IF amplifier, limiter, quadrature detector

• Signal meter

• Noise detector, noise amplifier, noise wave detector,
Schmitt trigger

Features

• Low voltage operation: V

CC OP

= 1.8 to 6 V

• Signal meter linear over a wide range (70 dB typical)

• High sensitivity, high intercept point

Package Dimensions

unit: mm

3112-MFP24S

Specifications

Maximum Ratings at Ta = 25°C

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max 7.0 V
Allowable power dissipation Pd max Ta ≤ 75°C 150 mW
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +125 °C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

CC

3.0 V

Operating supply voltage V

CC OP

1.8 to 6.0 V

[LA8670M]

SANYO:MFP24S

Operating Characteristics at Ta = 25°C, VCC= 3 V, fC(MIX) = 49.830 MHz, fmod = 1 kHz, ∆f = ±3 kHz

Note: AC levels are all indicated for open (EMF) circuits.

No. 4930-2/10

LA8670M

Parameter Symbol Conditions min typ max Unit

Quiescent current I

CCO

No input 7.3 9.5 mA
Mixer intercept point Ip3 First mixer –4.8 dBm
12 dB sensitivity 12dB S/N No input matching 3.2 5.0 dBµ
Demodulator output V

O

Vin = 80 dBµ 143 180 227 mVrms
Signal-to-noise ratio S/N No modulation, Vin = 80 dBµ 60 67 dB
AM rejection ratio AMR AM 30% modulation 35 43 dB
Total harmonic distortion THD Vin = 80 dBµ 2.2 3.0 %

V

SM (1)

Vin = 0 dBµ 0.05 0.30 0.65 V
Signal meter output V

SM (2)

Vin = 40 dBµ 0.60 0.90 1.40 V

V

SM (3)

Vin = 80 dBµ 1.05 1.40 1.85 V

Noise detector output

V

ND (1)

fi = 40 kHz, Vi = –50 dBV 0.10 0.25 V

V

ND (2)

fi = 40 kHz, Vi = –30 dBV 1.10 1.40 1.70 V

Noise detector level

V

14 (1)

Schmitt on 0.53 0.63 0.73 V

V

14 (2)

Schmitt off 0.33 0.43 0.53 V

Schmitt output level

V

SH (1)V14

= 0.8 V 0.3 V

V

SH (2)V14

= 0.2 V 2.8 V

Mixer conversion gain

G

M1

First mixer 19 dB

G

M2

Second mixer 24 dB
Mixer input frequency 90 MHz

Mixer input resistance

First mixer 5 kΩ

Second mixer 330 Ω

Mixer output resistance

First mixer 330 Ω

Second mixer 2.0 kΩ
FM detector output impedance 520 Ω

Equivalent Circuit Block Diagram

No. 4930-3/10

LA8670M

Test Circuit

No. 4930-4/10

LA8670M

Sample Application Circuit

No. 4930-5/10

LA8670M

Pin Functions

No. 4930-6/10

LA8670M

Pin No. Symbol Internal equivalent circuit Note

24

1

2

3

4

5

6

7

8

9

10

11

12

1st MIX-IN 2

1st MIX-IN 1

V

CC

1

1st OSC 1

1st OSC 2

OSC Buffer-OUT

2nd OSC 1

2nd OSC 2

2nd MIX-OUT

VCC2

IF-IN

D.C

IF-OUT

First mixer inputs

Power supply for the first mixer

Local oscillator inputs

Local oscillator buffer output

Local oscillator inputs
When external insertion is used, input the signal to
pin 6 and leave pin 7 open.

Second mixer output

Power supply

IF amplifier input

IF amplifier DC feedback

Limiter amplifier output

Continued on next page.

Continued from preceding page.

No. 4930-7/10

LA8670M

Continued on next page.

Pin No. Symbol Internal equivalent circuit Note

13

14

15

16

17

18

19

20

21

Quad.

Noise det.

Schmitt-OUT

Signal DET.

AF-OUT

Filter-IN

Filter-OUT

2nd MIX-IN 1

2nd MIX-IN 2

Discriminator connection

Noise detector

Noise Schmitt output

Field strength signal output

FM detector output

Noise filter input

Noise filter output

Second mixer input

Continued from preceding page.

No. 4930-8/10

LA8670M

Pin No. Symbol Internal equivalent circuit Note

22

23

1st MIX-OUT

GND

First mixer output

Ground

No. 4930-9/10

LA8670M

PS No. 4930-10/10

LA8670M

This catalog provide information as of May, 1995. Specifications and information herein are subject to change
without notice.

■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.

■ Anyone purchasing any products described or contained herein for an above-mentioned use shall:
➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and

distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:

➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on

SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.

■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.